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SuperPlus Leakproof® No-Show Bikini

$36.00 CAD

Buy 3+ Save 15%, Buy 5+ Save 20%

Absorbs 7-11 super tampons

Front-to-back liner

Bonded seams prevent leaks

Machine washable

Megan has 36.5” hips and wears KNIX S | Twilight Navy

Megan has 36.5” hips and wears KNIX S

| Twilight Navy
Megan has 36.5” hips and wears KNIX S | Twilight Navy

Megan has 36.5” hips and wears KNIX S

Megan has 36.5” hips and wears KNIX S | Twilight Navy

Megan has 36.5” hips and wears KNIX S

| General

Megan has 36.5” hips and wears KNIX S

Color: Twilight Navy

Size:

True to Size

Size:

Size and Fit Guide

Leakproof Underwear is Sales Tax Free in Canada*

Build Your 3-Pack

SuperPlus Leakproof® No-Show Bikini

Color: Twilight Navy

Size:

Size:

SuperPlus Leakproof® No-Show Bikini

Color: Twilight Navy

Size:

Size:

SuperPlus Leakproof® No-Show Bikini

Color: Twilight Navy

Size:

Size:

Free Shipping on orders $100+

Shipping

Shipping

Processing Timelines

Please allow 1-2 business days for our warehouse team to pack and ship your order. During peak periods such as sales, holidays and product launches, please allow up to 4 business days for us to process your order.

Delivery Time

For the most up-to-date delivery time estimates, please refer to the shipping timeline at checkout. Delivery timelines vary depending on location and do not include processing times.

Shipping Charges

Orders over $100* CAD = Free Shipping (2-6 business days)

Orders under $100* CAD = $12 CAD Shipping (1-3 business days)

Orders delivering to NWT, Nunavut and Yukon are subject to $20 delivery fee.

*After discounts, before shipping and taxes.

First Pair Risk Free for 30 Days

Leakproof Underwear, Risk Free

Returns & Exchanges

New to leakproof? Your first pair is risk free for 30 days. Wear them, wash them, and see how they work for your body. Not right for you? We'll refund the item price (original shipping excluded). Prefer a different size or style? We also offer free exchanges. Just email info@knix.com and we'll take care of you.

Purchased leakproof before? Within 30 days of delivery you can exchange for another size, style, or store credit. We're unable to provide refunds on underwear. If you ordered multiple pairs, please open, wash, and wear one pair only before initiating an exchange.

Still have questions? View our full policy here.

Rewards Members Earn 36 Points

Product Description

The most absorbent invisible period panty ever made. The Knix SuperPlus Leakproof No-Show Bikini is engineered for your heaviest days, absorbing an incredible 7 to 11 super tampons’ worth of flow. Despite its massive capacity, the seamless, raw-cut edges ensure it stays completely invisible under your tightest leggings or skirts. Featuring an extra-long gusset for 360-degree security, it’s the best high-absorbency no-show underwear for those who need maximum protection without the bulk.

Comfort-First Fit

Classic mid-rise bikini silhouette with medium coverage for hips and bum.

Ultimate Leakproof Protection

Our longest, most absorbent liner ever—front-to-back coverage without the bulk.

Day & Night Comfort

Buttery-soft stretch fabric moves with you, while bonded seams keep leaks contained and create a smooth, seamless look under clothing.

Machine Washable

Wash just like your regular underwear—easy, everyday care.

Zoom

Megan has 36.5” hips and wears KNIX S | Twilight Navy
| Twilight Navy
Megan has 36.5” hips and wears KNIX S | Twilight Navy
Megan has 36.5” hips and wears KNIX S | Twilight Navy
| General

How to Choose?

Essential

  • Days you don’t need leak protection. Everyday freshness and moisture wicking.
  • tsp
    0 tsp

Heavy

  • Extra peace of mind. For the first days of your cycle, light bladder leaks, or a full night's sleep without a leak.
  • tsp
    about 8-14 tsp
  • pad
    about 1.5-3 regular pads
  • tampon
    about 4-7 super tampons
  • cup
    about 1.5-3 menstrual cups

Light

  • Daily freshness. For sweat, discharge, period spotting, or backup protection.
  • tsp
    about 1-3 tsp
  • pad
    about 1-3 pantyliners
  • tampon
    about 1-3 regular tampons
  • cup
    about 0.5 menstrual cups

Moderate

  • For mid-cycle flow, surprise cough or sneeze leaks, or a really sweaty spin class.
  • tsp
    about 4-8 tsp
  • pad
    about 1-1.5 regular pads
  • tampon
    about 2-4 super tampons
  • cup
    about 0.5-3 menstrual cups

Ultra

  • Ultimate peace of mind. For the heaviest period days, light bladder leaks, unexpected postpartum flow, or overnight protection.
  • tsp
    about 15-20 tsp
  • pad
    about 1.5-2.5 super pads
  • tampon
    about 7-11 super tampons
  • cup
    about 2-3 menstrual cups
PATENTED LEAKPROOF TECHNOLOGY

Our longest, most absorbent liner—ever.

Our original Fresh Fix Technology® features a built-in absorbent liner that soaks up about 7–11 super tampons’ worth of liquid—so you stay fresh, comfortable, and in control.

Soft Top Layer

Gently wicks moisture away while keeping you feeling fresh and odor-free.

4.2
Rated 4.2 out of 5 stars
Based on 57 reviews
Total 5 star reviews: 41 Total 4 star reviews: 4 Total 3 star reviews: 3 Total 2 star reviews: 3 Total 1 star reviews: 6
Reviews Summary
Customers say these underwear are comfortable and provide good coverage for various needs. Many appreciate the soft fabric and extended absorbent area that runs front to back. Users find them effective for overnight wear and daily activities, with several noting increased confidence. Common praise includes the non-bulky feel and discreet appearance under clothing. However, sizing concerns are frequently mentioned, with many reporting they run smaller than expected. Some users experience issues with the underwear bunching up, riding up, or moving out of place during activity. While most find them effective for light to moderate flow, a few report breakthrough leaking on heavier days. The back thickness receives mixed feedback, with some finding it less breathable.
79%would recommend this product
ComfortRated 4.3 on a scale of 1 to 5
EffectivenessRated 4.3 on a scale of 1 to 5
FitRated -0.2 on a scale of minus 2 to 2
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57 reviews
  • Rated 5 out of 5 stars
    2 days ago
    Very comfy!

    I love these! So very comfortable! There was minor side leaks, but thankfully not too bad. But I will definitely purchase again!

    Alyson N.
    Verified Buyer
    Reviewing
    SuperPlus Leakproof® No-Show Bikini
  • Rated 5 out of 5 stars
    1 week ago
    Good fit

    Great fit and very comfortable. Covers leakage well. Nice color.

    Susan W.
    Verified Buyer
    Reviewing
    SuperPlus Leakproof® No-Show Bikini
  • Rated 5 out of 5 stars
    2 weeks ago
    Bladder leaks solved

    If you have any sort of bladder issues these underwear are game changers. Im more comfortable than I've ever been with my bladder leaks and living life. Im a fan!

    Amanda K.
    Verified Buyer
    Reviewing
    SuperPlus Leakproof® No-Show Bikini
  • Rated 5 out of 5 stars
    1 month ago
    Great

    I love these and will buy again

    Heather G.
    Verified Buyer
    Reviewing
    SuperPlus Leakproof® No-Show Bikini
  • Rated 5 out of 5 stars
    1 month ago
    Awesome

    Purchased for my teenage daughter and she loves them

    Melanie R.
    Verified Buyer
    Reviewing
    SuperPlus Leakproof® No-Show Bikini
  • Rated 5 out of 5 stars
    1 month ago
    These are the best

    I’m super impressed! It looks great and does exactly what it says it does

    Deborah P.
    Verified Buyer
    Reviewing
    SuperPlus Leakproof® No-Show Bikini
  • Rated 5 out of 5 stars
    1 month ago
    5 Stars

    Livraison super! Les grandeurs sont vraies! Je porte medium et les tailles ne sont pas trop petites ni trop grande, parfaites! Le tissus très doux on les oublient tellement confortable, on se sent bie au sec surtout!

    Marie-Eve
    Reviewing
    SuperPlus Leakproof® No-Show Bikini
  • Rated 5 out of 5 stars
    1 month ago
    Super plus No Show

    I love, love, love this. They are soft, comfortable, and the leakproof part is comfortable, not bulky. I forget I am wearing them!! Thank you :)

    Salinda P.
    Verified Buyer
    Reviewing
    SuperPlus Leakproof® No-Show Bikini
  • Rated 5 out of 5 stars
    1 month ago
    Like these

    Nice but I think thought they would be more like a cotton panty

    Christine D.
    Verified Buyer
    Reviewing
    SuperPlus Leakproof® No-Show Bikini
  • Rated 5 out of 5 stars
    1 month ago
    SuperPlus Leakproof® No-Show Bikini

    Would totally recommend these. They fit well and do their job on heavy days. A must have.

    Jennifer N.
    Verified Buyer
    Reviewing
    SuperPlus Leakproof® No-Show Bikini
  • Rated 5 out of 5 stars
    1 month ago
    Amazed

    As a first time buyer I was shocked how well it worked and I was able to use them the last few days for a menstrual cycle. I do gotta say these worked. I wish you had more ultra because I do go through them using ultra tampons that I would like to buy a few more to have some spares. I wish you had more colors or patterns. It was nice for once to not wear a tampon. What a change of pace. ☺️😉😉. I was able to wake up with no leakage on my bed. Really nice!

    Nicole S.
    Verified Buyer
    Reviewing
    SuperPlus Leakproof® No-Show Bikini
  • Rated 5 out of 5 stars
    1 month ago
    Love!

    I bought these for my daughter and she loves them. They are super comfortable and keep her feeling dry. She’s already asked for more!

    Meagan F.
    Verified Buyer
    Reviewing
    SuperPlus Leakproof® No-Show Bikini

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